digest.c

/* crypto/evp/digest.c *//* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) * All rights reserved. * * This package is an SSL implementation written * by Eric Young (eay@cryptsoft.com). * The implementation was written so as to conform with Netscapes SSL. * * This library is free for commercial and non-commercial use as long as * the following conditions are aheared to. The following conditions * apply to all code found in this distribution, be it the RC4, RSA, * lhash, DES, etc., code; not just the SSL code. The SSL documentation * included with this distribution is covered by the same copyright terms * except that the holder is Tim Hudson (tjh@cryptsoft.com). * * Copyright remains Eric Young's, and as such any Copyright notices in * the code are not to be removed. * If this package is used in a product, Eric Young should be given attribution * as the author of the parts of the library used. * This can be in the form of a textual message at program startup or * in documentation (online or textual) provided with the package. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * "This product includes cryptographic software written by * Eric Young (eay@cryptsoft.com)" * The word 'cryptographic' can be left out if the rouines from the library * being used are not cryptographic related :-). * 4. If you include any Windows specific code (or a derivative thereof) from * the apps directory (application code) you must include an acknowledgement: * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" * * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * The licence and distribution terms for any publically available version or * derivative of this code cannot be changed. i.e. this code cannot simply be * copied and put under another distribution licence * [including the GNU Public Licence.] *//* ==================================================================== * Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. All advertising materials mentioning features or use of this * software must display the following acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" * * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to * endorse or promote products derived from this software without * prior written permission. For written permission, please contact * openssl-core@openssl.org. * * 5. Products derived from this software may not be called "OpenSSL" * nor may "OpenSSL" appear in their names without prior written * permission of the OpenSSL Project. * * 6. Redistributions of any form whatsoever must retain the following * acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit (http://www.openssl.org/)" * * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED * OF THE POSSIBILITY OF SUCH DAMAGE. * ==================================================================== * * This product includes cryptographic software written by Eric Young * (eay@cryptsoft.com). This product includes software written by Tim * Hudson (tjh@cryptsoft.com). * */#include <stdio.h>#include "cryptlib.h"#include <openssl/objects.h>#include <openssl/evp.h>#ifndef OPENSSL_NO_ENGINE#include <openssl/engine.h>#endifvoid EVP_MD_CTX_init(EVP_MD_CTX *ctx)
{
memset(ctx,'\0',sizeof *ctx);
}
EVP_MD_CTX *EVP_MD_CTX_create(void)
{
EVP_MD_CTX *ctx=OPENSSL_malloc(sizeof *ctx);
EVP_MD_CTX_init(ctx);
return ctx;
}
int EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type)
{
EVP_MD_CTX_init(ctx);
return EVP_DigestInit_ex(ctx, type, NULL);
}
int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl)
{
EVP_MD_CTX_clear_flags(ctx,EVP_MD_CTX_FLAG_CLEANED);
#ifndef OPENSSL_NO_ENGINE/* Whether it's nice or not, "Inits" can be used on "Final"'d contexts * so this context may already have an ENGINE! Try to avoid releasing * the previous handle, re-querying for an ENGINE, and having a * reinitialisation, when it may all be unecessary. */if (ctx->engine && ctx->digest && (!type ||
(type && (type->type == ctx->digest->type))))
goto skip_to_init;
if (type)
{
/* Ensure an ENGINE left lying around from last time is cleared * (the previous check attempted to avoid this if the same * ENGINE and EVP_MD could be used). */if(ctx->engine)
ENGINE_finish(ctx->engine);
if(impl)
{
if (!ENGINE_init(impl))
{
EVPerr(EVP_F_EVP_DIGESTINIT_EX,EVP_R_INITIALIZATION_ERROR);
return 0;
}
}
else/* Ask if an ENGINE is reserved for this job */
impl = ENGINE_get_digest_engine(type->type);
if(impl)
{
/* There's an ENGINE for this job ... (apparently) */const EVP_MD *d = ENGINE_get_digest(impl, type->type);
if(!d)
{
/* Same comment from evp_enc.c */
EVPerr(EVP_F_EVP_DIGESTINIT_EX,EVP_R_INITIALIZATION_ERROR);
return 0;
}
/* We'll use the ENGINE's private digest definition */
type = d;
/* Store the ENGINE functional reference so we know * 'type' came from an ENGINE and we need to release * it when done. */
ctx->engine = impl;
}
else
ctx->engine = NULL;
}
elseif(!ctx->digest)
{
EVPerr(EVP_F_EVP_DIGESTINIT_EX,EVP_R_NO_DIGEST_SET);
return 0;
}
#endifif (ctx->digest != type)
{
if (ctx->digest && ctx->digest->ctx_size)
OPENSSL_free(ctx->md_data);
ctx->digest=type;
if (type->ctx_size)
ctx->md_data=OPENSSL_malloc(type->ctx_size);
}
#ifndef OPENSSL_NO_ENGINEskip_to_init:
#endifreturn ctx->digest->init(ctx);
}
int EVP_DigestUpdate(EVP_MD_CTX *ctx, constvoid *data,
size_t count)
{
return ctx->digest->update(ctx,data,count);
}
/* The caller can assume that this removes any secret data from the context */int EVP_DigestFinal(EVP_MD_CTX *ctx, unsignedchar *md, unsignedint *size)
{
int ret;
ret = EVP_DigestFinal_ex(ctx, md, size);
EVP_MD_CTX_cleanup(ctx);
return ret;
}
/* The caller can assume that this removes any secret data from the context */int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsignedchar *md, unsignedint *size)
{
int ret;
OPENSSL_assert(ctx->digest->md_size <= EVP_MAX_MD_SIZE);
ret=ctx->digest->final(ctx,md);
if (size != NULL)
*size=ctx->digest->md_size;
if (ctx->digest->cleanup)
{
ctx->digest->cleanup(ctx);
EVP_MD_CTX_set_flags(ctx,EVP_MD_CTX_FLAG_CLEANED);
}
memset(ctx->md_data,0,ctx->digest->ctx_size);
return ret;
}
int EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in)
{
EVP_MD_CTX_init(out);
return EVP_MD_CTX_copy_ex(out, in);
}
int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in)
{
unsignedchar *tmp_buf;
if ((in == NULL) || (in->digest == NULL))
{
EVPerr(EVP_F_EVP_MD_CTX_COPY_EX,EVP_R_INPUT_NOT_INITIALIZED);
return 0;
}
#ifndef OPENSSL_NO_ENGINE/* Make sure it's safe to copy a digest context using an ENGINE */if (in->engine && !ENGINE_init(in->engine))
{
EVPerr(EVP_F_EVP_MD_CTX_COPY_EX,ERR_R_ENGINE_LIB);
return 0;
}
#endifif (out->digest == in->digest)
{
tmp_buf = out->md_data;
EVP_MD_CTX_set_flags(out,EVP_MD_CTX_FLAG_REUSE);
}
else tmp_buf = NULL;
EVP_MD_CTX_cleanup(out);
memcpy(out,in,sizeof *out);
if (out->digest->ctx_size)
{
if (tmp_buf) out->md_data = tmp_buf;
else out->md_data=OPENSSL_malloc(out->digest->ctx_size);
memcpy(out->md_data,in->md_data,out->digest->ctx_size);
}
if (out->digest->copy)
return out->digest->copy(out,in);
return 1;
}
int EVP_Digest(constvoid *data, size_t count,
unsignedchar *md, unsignedint *size, const EVP_MD *type, ENGINE *impl)
{
EVP_MD_CTX ctx;
int ret;
EVP_MD_CTX_init(&ctx);
EVP_MD_CTX_set_flags(&ctx,EVP_MD_CTX_FLAG_ONESHOT);
ret=EVP_DigestInit_ex(&ctx, type, impl)
&& EVP_DigestUpdate(&ctx, data, count)
&& EVP_DigestFinal_ex(&ctx, md, size);
EVP_MD_CTX_cleanup(&ctx);
return ret;
}
void EVP_MD_CTX_destroy(EVP_MD_CTX *ctx)
{
EVP_MD_CTX_cleanup(ctx);
OPENSSL_free(ctx);
}
/* This call frees resources associated with the context */int EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx)
{
/* Don't assume ctx->md_data was cleaned in EVP_Digest_Final, * because sometimes only copies of the context are ever finalised. */if (ctx->digest && ctx->digest->cleanup
&& !EVP_MD_CTX_test_flags(ctx,EVP_MD_CTX_FLAG_CLEANED))
ctx->digest->cleanup(ctx);
if (ctx->digest && ctx->digest->ctx_size && ctx->md_data
&& !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE))
{
OPENSSL_cleanse(ctx->md_data,ctx->digest->ctx_size);
OPENSSL_free(ctx->md_data);
}
#ifndef OPENSSL_NO_ENGINEif(ctx->engine)
/* The EVP_MD we used belongs to an ENGINE, release the * functional reference we held for this reason. */
ENGINE_finish(ctx->engine);
#endif memset(ctx,'\0',sizeof *ctx);
return 1;
}